Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
has the truck been checked for trouble codes, BCM?
I looking at schematics now
BCM controls the wipers and uses the switch as an input.
These GM trucks and vans are known to have issues with the fuse box under the hood.
always good to check for codes but since you have replaced the wiper motor and the switch I would start with checking codes in the BCM and then I would be leaning towards the under hood fuse box.
you need an advanced scanner to check for modules like this. take a look at the under hood fuse box and tell me what it looks like
If there is an issue you might get the wipers to shut off by shocking . I use a rubber hammer , even moving it or disconnection will get electronics to work just long enough to confirm
I have replaced the fuse boxes many times for several faults, no programing needed nd most dealers will stock it. If the dealers have a bunch in stock it usually means it is a common failure.
fuse box goes for about 250$.
yep, some relays are internal and not removable
dealers and shops have the advantage to use advanced scanners to see if there are codes and check modules to see if the component is being commanded on. Shock the fuse box.
BCM we just check for codes. yes
try removing it check the relays and fuses for corrosion. another sign it is time to replace it
Many times the corrosion is inside and not easy to see.
ok, worth a shot. I have done the shock test and the wiggle test (wire harness) to confirm faults like this.
Sometimes with modules and fuse box issues pin fit on connector can cause faults. pins or tabs can show black spots/wear that cause poor connections and high resistance.
ok, let me know what happens. without being able to check the BCM live data or even for codes we are limited.
no. where did you get the wiper motor from? reman?
I would as a dealer for the part # and price. Then I would check e-bay. you will have the choice of new or used for much less than the dealer. To make sure it is right the we check with the dealer. They will use your vin #(last 8) to make sure the fuse box is right.
I would replace the fuse box before the BCM. I would not replace the BCM before checking codes and the BCM would need to be programed
BCM is under dash drivers side